85681618658 has 32 divisors (see below), whose sum is σ = 130791976560. Its totient is φ = 42091545600.

The previous prime is 85681618609. The next prime is 85681618679.

85681618658 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 13399683049 + 72281935609 = 115757^2 + 268853^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 85681618658.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35803910 + ... + 35806302.

Almost surely, 2^85681618658 is an apocalyptic number.

85681618658 is a deficient number, since it is larger than the sum of its proper divisors (45110357902).

85681618658 is a wasteful number, since it uses less digits than its factorization.

85681618658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3782.

The product of its digits is 22118400, while the sum is 62.

The spelling of 85681618658 in words is "eighty-five billion, six hundred eighty-one million, six hundred eighteen thousand, six hundred fifty-eight".